The four-times Tour de France winner defended his decision to continue to compete while he challenges an adverse finding from the Vuelta a España last September, which indicated double the permitted level of the asthma drug salbutamol in his system.

Floyd Landis said the only people who still believe in Team Sky are those who think the US president, Donald Trump, is telling the truth as the former cyclist called for Sir Bradley Wiggins to be stripped of his 2012 Tour de France title. The American, a one-time doper turned informant, delivered a scathing assessment of Wiggins and the Team Sky principal, Sir Dave Brailsford, who remained silent amid further calls for his resignation.

I really want to believe in the integrity of the British team. Yet each new doping allegation is making it harder

How to feel when, for reasons that are purely negative, the sport you love and the riders you admire appear on every front page and dominate every radio news bulletin? The answer: weary, conflicted and confused.

• Froome returned adverse analytical finding last September in Spain• Froome and Team Sky say legal dose can lead to adverse results

One of Chris Froome’s most likely defences against a possible anti-doping charge does not appear to be supported by UK Anti-Doping data released via a freedom of information request.

The Team Sky cyclist returned a urine sample with twice the allowed concentration of the asthma drug salbutamol – what is known as an adverse analytical finding (AAF) – during his winning ride at the Vuelta a España last September.

Floyd Landis has launched a stinging attack on Team Sky, claiming the idea of marginal gains and a zero tolerance policy is a facade and “just great PR”. The former American rider who turned informant after testing positive for drugs himself scoffed at possible explanations for Chris Froome’s failed test and expects the fallout to be a death knell for Team Sky after eight years at the top.

Former US Postal Service rider Landis, who won the Tour de France in 2006 before being told of a positive test for testosterone 72 hours later, contributed to the downfall of Lance Armstrong with his testimony of widespread doping in cycling.